Apparatus for removing liquids from perforated rotating shells



, .Z-JZVEIZLUPS Jolzzz E Goodzgg'L ie Ljo yd Horzzboa'gl a: 5 Ui%% 66 w,M H

GOODWILLIE ET Al. APPARATUS FOR REMOVING LIQUIDS FROM Feb. 23, 1954 J.E,

PERFORATED ROTATING SHELLS Filed May 13 Patented Feb. 23, 1954 UNITEDSTATES PATENT OFFICE APPARATUS FOR REMOVING LIQUIDS FROM PERFORATEDROTATING SHELLS .Application' May 13, 1949, SeriallNo.' 93,144

The-present invention relates to apparatus for removing liquids fromperforated rotating. shells, and more particularlyv to apparatus forremoving liquids from the surface'perforations of-a rotatable suctionshell or drum employediin-a papermaking machine.

The employment of. suction rollssor drums in paper making machinesutoremovewater from the wet paper'web'has longbeen known in the art. Suchsuction drums are typically provided with means for. receivingwaterremoved :from the web and for'conveyingtthi water from the interior of.the shell. However, fully satisfactory means has .not heretofore'beenprovided for-removing Water from the relatively small diameterperforations or holes'inthe shells of 'such drums. It has been foundthat, in certain applications, particularly in those .machineswhichoperate at low web speeds, the centrifugal force generated uponrotation-of the shell is insufficient to throw water outwardly from theholes or perforations of the shell. .A'ccordingly moistureor water inthese perforations wilLnot: be effectively :removed, and this moisturemay later contact the web. to interfere with the drying efficiency ofthedrum.

1 The present invention'now providesnoveland inexpensive means for.effectivelyrremoving liquids from the surface perforations.ofrotatable, perforated shells or-suction drums. Intgeneral, thepresent invention includes means for introducing gaseous fluid-under.pressure into the interior of the rotating drum or shell with the escapeof this .fluid throughthe. surface; perforations "of thedrum carryingwithitany-liquid contained therein. -Means '...are also. provided for.catching the liquid thus escaping fromthedrmn'and for conveying theliquid from th machine Without the possibilityof Wetting the paperweb.

The means of the present invention. may be used in connection with: a 1suction .drum-orsroll at any :place where such: andrummay. 'be employedin a PBper-makingmachine. For example,. the present --.invention may heemployed in connection with a suction :drum': press assembly; or with,a. suction roll positioned inthedrier press -assembly f the-.- machine.Alternatively, the devic of thepresent-invention may be mployed inconnection with suction rolls positioned in other portions' ofithemachine; as with a sucti'on couch roll.

A "feature. of thisinvention is: its adaptability to; standard suction-.roll.; constructions so. that, it canilaes. added to the.::conventional assemblies-lay mereaddition-ofipart's.

51131518, therefore,.-.anaimportantoobjectuof the invention to providean improved-.roll-assemblv fora papermaking-machine including asuctiondrum and means forremoving.:liquid-.if1:om"the surfac perforations ofthe drum.

I Still another important object-ofthepresent invention is to providean.improvedaapparatus for the removal of liquidfromwthesurfaceiperforationsof asuction roll-.including-meansf forintroducing a fluidunder DreSsureHintQltheQinterior of the rollfor=.escape through the surface perforations thereof in combinationwitnmeans for receivingliquid thus removedfr'omitheroll.

Other. andfurther important objects of Ztli'is invention will beapparent..from..th ..d=isclosures in the specification and theaccompan'yingidrawings.

On the drawings:

Figure 1 vis-aufragmenta ryt vertical. crossisection,. partially.diagrammatic .in.'.form,..andwith parts in. elevation, of .a.su'ctionepressdassembly for i a paper making machine .embodying'the.present invention; and

. Figure 2 is..a similar vertical cross. section a: adifierent type of.pressiassern'bly.alsoequippd with the shell. de-watering construction.er; the present invention.

. .As shown onthe drawings:

'LInfFigure 1, reference mimerat llllrefersJgenerally to asuctionpress.assemblyincluding-5a pair of cooperating suction press drums orriills II and l2-fdefining'therebetween a suction...iiip l3 receiving awet. paper web -I 4. .interposed.between cooperating press" felts"l5.and Hi.

"The suction roll I I includes-a rctatablymounted,. radially perforatedcylindenorfshell l'lI- journaled. at. its. ends, as conventional-intheart, for rotation. about its longitudinal. axis. ..-.A suction gland orbox 18 is disposed-.within"thecylinder I! and extends alongthe interiorof. thepiilirider I! in a'direction substantially parallel-to itsaids ofrotation. 'The suction gland .i fitcar-riesmadially outwardly extending.packing strips i 9. conta'cting-v the inner peripheralsurface-.ofithecylinder l1 fat. peripherally; spaced points. I The.packing strips I 9. cooperate-to define .therebetweenz'aaela tively'broadvlocalizedsuctioniareaam on thaw-1 indenpr shell I].

The suction drum or roll |2 includes an outer rotatable, radiallyperforated, cylinder substantially identical in construction with thecylinder hereinbefore described. The suction gland or box 2| is mountedin the interior of the cylinder 29 and extends generally parallel to theaxis of rotation of the cylinder 20. The suction gland 2| is providedwith a plurality of packing strips extending radially outwardlytherefrom into contact with the inner periphery of the drum 29. A pairof packing strips 22 and 23 is disposed in the lower portion of the drumI2 immediately above the restricted nip |3. The strips 22 (on theon-coming side of the nip) and 23 (on the off-running side of the nip)cooperate with the inner periphery of cylinder 20 to define a relativelynarrow suction area B.

A third packing strip 24 cooperates with the strip 23 to define asuction area C which is of substantially greater width than the suctionarea'B.

The suction gland 2| is provided with a relatively narrow, reducedopening 25 for connecting the suction area C with the interior of thegland, while the mouth 26 affording communication with the suction areaB is unobstructed. A butterfly-type valve 21 is provided in therestricted opening 25 to adjust the size of the opening 'for varying thesuction in the suction area C as compared with the suction in thesuction area B. The butterfly valve 21 may be controlled byany suitablemeans (not shown), as by a control lever extending beyond one circularend face of the cylinder 20 to vary the relative suction values in theareas B and C.

An additional packing strip 28 is provided in spaced relation to thepacking strip 24 to define an arcuate, relatively broad area 29 in theinterior of the cy1inder'29. The area 29 is peripherally spaced on theoff-running side from the suction areas B and C so that, whenthecylinder is rotated, the periphery of the cylinder first passes thesuction area B, then the suction area 0, then the area 29.

A fluid manifold or conduit'30 is connected to a'suitable source offluid (i. e. gas) ,under pressure, as for example, air, and communicateswith the periphery of the drum l2 at thatportion of the outer surface ofthe cylinder 20 overlyingthe chamber 29 (and adjacent the packing strip28).

Communication between the manifold 39 and the chamber 29 is provided bymeans of the manifold outlet mouth 3| provided with terminal packingstrips 32 which extend into contact with or into closely spaced relationto the outer peripheryof the cylinder 20 (thereby effecting asubstantial seal therebetween). It will be seen in Figure 1 that fluidunder pressure .above the manifold will be introduced into the chamber29 through the radial perforations 29a of the cylinder 20 and that thefluid under pressure so introduced into chamber 29 will be free toescape fromthe cham her through additional perforations. 29a not alignedwith the inlet mouth 3|. (and atan exposed portion of the shell l2 notcovered by the manifold 39 or the felt l6), 7 Fluid under pressureescaping through the perforations 20a will carry with it any water,which might be lodged in these perforations. A catchall trough or shield33 is disposed adjacent the cylinder 20 to overlie that portion of thecylinder adjacent the chamber 29 to receive water and air'forced fromthe cylinder by the fluid under pressure. The shield 33 isprov'ided'with a lower horizontal leg 34 which extends into; closelyspaced relation to the periphery of the cylinder 20 with an upturnedterminal lip 35 preventing the escape of liquid from the trough whilepermitting the escape of excessive fluid pressure therefrom. A drainfrom the trough 33 is provided by a drain line 36 in the lower portionthereof.

As shown in Figure 1, the wet paper web M, carried by press felt I5, islapped about that portion or roll ahead of the nip It, the web and feltoverlying the suction area A of the roll I. The other press felt I6 isguided into contact WlththQ web M while the web is supported by roll IIand immediately ahead of the nipv l3 so that the web |4 itself is notcontacted by the roll l2. Water from the web will be drawn into suctionbox I8 of roll due to the contact of the web ,l4 and the press felt l5with the suction area A. Upon passing through the nip l3, therelativelyhigh suction of the suction area B will serve to further de-water themoist web M. However, a portion of the water removed from the web l4 andthe felts 5 and I6 will remain in the radial perforations 20a of thecylinder 29. The relatively low suction of suction area C, as determinedby the setting of the butterfly valve 21, will retain this water withinthe perforations 29a to prevent are-wetting of the web as it leaves thenip.

The present invention efliciently removes all water'from the shell holesor perforations by forcing air under pressure'into the chamber 29 andthen allowing this fluid to escape through the perforations into theinterior of th'catch-all shield or bafiie 33. In this manner, effectiveremoval of water from the perforations'zlla is insured despite the speedof travel of the web l4. It will 'be noted that the air chamber 29 iscreated by merely adding the single packing 29 to the suction roll l2and by merely closing the ends of the chamber with end' deckle plates orextensions of plates for the chambers 13 and C.

' In Figure 2, a modification of the apparatus of Figure l is shown asemployed in a press section equipped with a bottom suction roll l2 and aplain top roll 31. However, the shell de-watering construction isessentially the same as shown in Figure 1 and identical referencenumerals designate similar parts of the apparatus. The operation oftheshell de-watering device of Figure 2, is identical with the operation ofthe device of Figure las will be readily appreciated by those skilled inthe art.

Itfwill, of course, be understood that various details of constructionmay be varied through a wide' range without departing from theprinciples' ofthis invention and it is, therefore, not the purpose tolimit the patent granted hereon otherwise'than necessitated by the scopeof the appended claims.

We claim as our invention:

" 1. In a; paper machine, a first press roll, a second press rolldefining a press nip therewith, a felt trained through said press nip,means conveyingthe felt away from the first press roll surface at'theoff-running sideof the press nip providin'g'an exposed portion ofthefirst press roll surface atthe off-running side, said first pressroll having a perforate rotating roll shell, a stationary suction glandmounted within said roll shell, first sealing means on said glandcooperating with said shell to definea suction area in the first pressroll at said press nip, second sealing means on said gland defining afluid pressure chamber between the gland andit'he shell extendf-romadjacent the suction area to a point answers 5. angularly displaced fromthe suction area-011 1711 off-running side oftheexposedportiorr of-saidfirst press roll, said second sealing means includ inga packing-stripatsaid point, a conduitmouuted 'outside the roll shell; adjacent :saidpointland connected to asource of gas under -pressme,:thir'd sealinmeansdnounted cn-said-conduit and cooperating with said shell to conducta gas blast fromwsaid conduit through said shell adjacent said;pointinto said-fiuid pressure chamber and then outthroughtheex-posed-portion of sa'id first press roll; and stationary fiuidpressure receiving means positioned exteriorly of said shell oppositethe exposed portion of said first .press roll to receive fluid forcedback through the shell.

2. In a paper machine having a first press roll, a second press rolldefining a press nip therewith, a felt trained through said press nip,and means conveying the felt away from the first press r011 surface atthe off-running side of the press nip providing an exposed portion ofthe first press roll surface at the off-running side, the improvement inwhich said first press roll is provided with a perforate rotating rollshell, a stationary suction gland mounted within said roll shell, firstsealing means on said gland cooperating with said shell to define asuction area in the first press roll at said press nip, a pair ofpacking strips on said gland defining a fluid pressure chamber betweenthe gland and the shell extending from adjacent the suction area whereone of the strips is positioned to a point where the other of the stripsis positioned angularly displaced from the suction area on theoff-running side of the exposed portion of said first press roll, aconduit mounted outside the roll shell adjacent said point and connectedto a source of gas under pressure, second sealing means mounted on saidconduit and operating with said shell to conduct a fluid blast from saidconduit through said shell adjacent said point into said fluid pressurechamber and then out through the exposed portion of said first pressroll, and stationary fluid pressure receiving means positionedexteriorly of said shell opposite the exposed portion of said firstpress roll to receive fluid forced back through the shell.

3. In a paper machine having a first press roll, a second press rolldefining a press nip therewith, a felt trained through said press nip,means conveying the felt away from the first press roll surface at theoff-running side of the press nip providing an exposed portion of thefirst press roll surface at the off-running side, the improve ment inwhich said first press roll is provided with a perforate rotating rollshell, a stationary suction gland mounted within said roll shell, firstsealing means on said gland cooperating with said shell to define afirst suction area in the first press roll at said press nip, secondsealing means on said gland defining a second suction area immediatelyadjacent the first area, third sealing means on said gland defining afluid pressure chamber between the gland and the shell extending fromadjacent the second suction area to a point angularly displaced from the"second suction area on the off-running side of the exposed portion ofsaid first press roll, said third sealing means including a packingstrip at said point, a conduit mounted outside the roll shell adjacentsaid point and connected to a source of gas under pressure, thirdsealing means mounted on said conduit and cooperating with said shell toconduct a gas blast from said conduit-through said shell adjacent saidpoint into said fluid pressure chamber and then out through the exposedportion of said first press roll, and

tioned -exteriorly of saidshell "opposite ithw fexposed port-ion' -of'saidifirst' press roll to receive fluid fdrced back Ethr ough theshell.

4. In a papermachine having a first press roll, a secondepressrolldefining' a press n-ip therewith, a felttrainedithroilfglrasaidpress1.nip,;.and means conveying the felt awayfromtthe first press roll surfacetatcthe off-running. sideioft thepressnip providinglan exposed portionrbfgtthe firsttpress r1111isurface-at'the (in-running side, theimprovem'ehtiin which saidfi'rstpress roll is proivid'ed with a perforate'rotating"shell, a stationarysuction gland mounted within said roll shell, a first packing strip onthe gland at the on-coming side of the press nip, a second packing stripon the gland at the off-running side of the press nip and cooperatingwith the first strip and the shell to define a suction area in the firstpress roll at said press nip, a third packing strip on the gland atapoint angularly displaced from the second packing strip on theoff-running side of the exposed portion of -said first press roll andcooperating with a baffie portion of said gland and the second packingstrip to define a fluid pressure chamber between the gland and theshell, a conduit mounted outside the roll shell adjacent said point andconnected to a source of gas under pressure, sealing means mounted onsaid conduit and cooperating with said shell to conduct a gas blast fromsaid conduit through said shell adjacent said point into said fiuidpressure chamber and then out through the exposed portion of said firstpress roll, and sta tionary fluid pressure receiving means positionedexteriorly of said shell opposite the exposed portion of said firstpress roll to receive fluid forced back through the shell.

5. In a paper machine having afirst press roll, a second press rolldefining a press nip therewith, a felt trained through said press nip,and means conveying the felt away from the first press roll surface atthe off-running side of the press nip providing an exposed portion ofthe first press roll surface at the off-running side, the improvement inwhich said first press roll is provided with a perforate rotating shell,a stationary suction gland mounted within said roll shell, a firstpacking strip on the gland at the on-coming side of the press nip, asecondpacking strip on the gland at the off-running side of the pressnip and cooperating with the first strip and the shell to define a firstsuction area in the first press roll at said press nip, a third packingstrip on the gland angularly spaced from the second strip andcooperating therewith to define a second suction area immediatelyadjacent and at the off-running side of the first suction area, a fourthpacking strip on the gland at a point angularly displaced from the thirdpacking strip on the off-running side of the exposed portion of saidfirst press roll and cooperating with a baflle portion of said gland andthe third packing strip to define a fluid pressure chamber between thegland and the shell, a conduit mounted outside the roll shell adjacentsaid point and connected to a source of gas under pressure, sealingmeans mounted on said conduit and cooperating with said shell to conducta gas blast from said conduit through said shell adjacent said pointinto said fluid pressure chamber and then out through the exposedportion of said first press roll, and stationaryfluid pressure receivingmeans positioned exteriorly of said shell 7 opposite "the exposedportion of said first press Number roll to receive fluid forced backthrough the shell. 2,054,391

' 1 JOHN E. GOODWILLIE. 2,209,759

LLOYD 'HORNBOSTEL. 2,338,465

' a v 5 2,415,351 *References Cited in the file of this patent 2,429,689

UNITEDSTATES PATENTS Number v Name I Date Number 1,234,543 Hellstrom'July 24, 1917 329 7 1,520,489 Wagner D60. 23, 1924 377 440 1,892,306Hillier Dec. 2'7, 1932 531,879

1,914,742 Hillier June 20, 1933 Name v Date Schmidt 'Sept. 15, 1936Berry July 30, 1940 Street"; Jan. 4,1944 Hornbostel et a1 Feb. 4, 1947Hornbostel Oct. 28, 1947 FOREIGN PATENTS I Country Date Germany Dec. 7,1920 I Germany June 18, 1923 Great Britain Jan. 13, 1941

